Loom temple with a weft thread cutting device



April 1964 c. L. L. BULCOCK LOOM TEMPLE WITH A WEFT THREAD CUTTING DEVICE Filed May l,- 1961 Co -m LEONARD Lucas 801.com

45 g at v United States Patent 3,127,914 1.00M TEMPLE WiTH A WEFT THREAD QUTTING DEVICE Colin L. L. Bulcock, Ciitheroe, England, assignor to Lupton Brothers Limited, a corporation of Great Britain Filed May 1, 1961, Ser. N0. 106,921 Claims priority, application Great Britain May 4, 1960 2 Claims. (Cl. 139-303) The invention concerns loom temples and in particular relates to a temple having a weft thread cut-off device whereby weft thread extending beyond the edge of the web may be severed.

In automatic looms, upon bobbin or shuttle change, the weft threads are cut off by means of special shears. Such devices as have been proposed suffer from various disadvantages and frequently the requirement that the cutting mechanism shall sever the weft close to the selvedge of the fabric is not met.

It is among the objects of the present invention to provide a cut-off device which will ensure the severance of the weft close to the selvedge, which will be efficient in operation and which will be simple and inexpensive in manufacture.

According to the present invention a loom temple is characterized by cutter means whereby weft threads extending outwardly beyond the selvedge of the web being woven may be severed, such cutter means comprising a bar member in sliding engagement with a downwardly inclined guide channel in, for example, the temple casting, a cutter block secured to a remote end of said bar member for motion therewith and a cutter bolt adapted for reciprocatory motion therewith, and a cutter bolt adapted for reciprocatory motion relative to a guide channel in said block, there being provided slots in said block of such form and dimensions as to allow entry of weft threads into the path of the cutter bolt for severance thereby.

The invention will now be described further, by way of example only, with reference to the accompanying drawings illustrating one particular embodiment thereof and in which:

FIG. 1 is a front elevation of a loom temple incorporating cutter means according to the invention; and

FIG. 2 is a side elevation of the assembly shown in FIG. 1.

Referring now to the drawings a loom temple assembly 11 has provided therefor cutter means 12 whereby weft threads may be removed automatically from a woven fabric, such means 12 comprising a bar member 12a in sliding engagement with a downwardly directed guide channel or groove 12b in the face of the temple casting 11a, a cutter block 120 secured to one end of the bar member 12a and a cutter bolt 12d capable of reciprocatory motion in a through hole 12:: in said cutter block 12c.

The bar member 12a is straight and unbent and is of trapezoidal cross-section and is fitted into a complementarily cross-sectioned undercut channel or groove 12b in the face of the casting; the angle of inclination of the channel to the horizontal is approximately The cutter block 12c is secured substantially transversely of the bar member. The lower part of the cutter block has a plurality of slots 12 therein, such slots 12 lying in planes transversely of the block and being of a depth in excess of half the total thickness of the block.

Disposed within the cutter block 12c is the bolt 12d, such bolt 12d being adapted to be reciprocated in synchronism with the motion of the loom slay.

Reciprocatory motion of the cutter bolt 12d is effected by a pivoted lever assembly 13 mounted upon the temple casting 11a. The assembly 13 comprises a cranked lever 13a pivotally mounted for motion about a substantially horizontal axis by a screw 13b, a splined rod 130 extending from the end of one arm of the lever 13a and lying in the same plane as the bar member 12a and an abutment screw 13d disposed at the end of the other arm of the lever 13a. The end of the cutter bolt 12d is formed into a coil 12d which is disposed about the rod 13c.

In operation the vibration of the loom will cause the bar member 12a to slide, under the action of gravity, down the inclined channel 12b, such motion being arrested upon the abutment of the cutter block with the selvedge of the woven web. In this position weft thread ends may enter the slots 12 in the cutter block 120 and thereby move into the path of the cutter bolt 12d, the latter being a close fit in the block 120 and having a cutting edge thereon. Reciprocatory motion of the bolt 12d is effected by virtue of the abutment of the loom slay with the screw 13d and the consequent pivotal motion of the lever 13a and upon such reciprocatory motion the thread is severed.

The invention is not restricted to the particular features of the embodiment hereinbefore described since alternatives will readily present themselves to one skilled in the art. For example, the actual cross sectional form of the bar member 12a and the co-operating channel 12b may be varied to suit particular requirements without any loss of advantage. Furthermore, although a splined rod has been used to receive the upper end of the cutter bolt, a rod having other cross-sections may be used.

I claim:

1. A loom temple including cutter means for the severance of weft threads extending outwardly beyond the selvedge of the web being Woven, the cutting means consisting of, a temple casting provided with a face portion having an inclined, undercut groove extending across it, a straight bar conforming in cross-sectional shape to the groove and being non-rotatively and slidably mounted in the groove, the bar being provided at one end with a cutter block rigidly attached to it, the cutter block having its axis disposed at a flat angle to the longitudinal axis of the bar, the angle of the bar in respect to the axis of the cutter block being such as to conform to the angularity of the groove whereby the maintenance of the bar in the angular groove will dispose the cutter block substantially vertically and the inclination of the groove and the angle at which the bar is disposed therethrough permitting longitudinal gravitational sliding movement of the bar through the groove and relatively to the groove to cause lowering movement of the cutter block to thread-engaging position, a cutter-bolt slidable through the axial passage in the cutter block, a portion of the cutter block being provided with notches for weft thread engagement to enable the threads so engaged to be severed by movement of the cutter bolt, and means for reciprocating the cutter bolt.

2. A loom temple and cutting means as provided for in claim 1, wherein the undercut groove in the face of the temple casting is of trapezoidal cross section and the bar therein is of complementary cross-sectional shape, the cutter bolt being provided at one end with a coil, a rod engaged by the coil, and a rocking lever including an arm secured to the rod.

References Cited in the file of this patent UNITED STATES PATENTS 1,819,540 Burdett Aug. 18, 1931 2,131,788 Stevenson Oct. 4, 1938 2,608,218 Bahan Aug. 26, 1952 2,635,647 Nichols Apr. 21, 1953 FOREIGN PATENTS 1,049,319 Germany Jan. 22, 1959 771,424 Great Britain Apr. 3, 1957 

1. A LOOM TEMPLE INCLUDING CUTTER MEANS FOR THE SEVERANCE OF WEFT THREADS EXTENDING OUTWARDLY BEYOND THE SELVEDGE OF THE WEB BEING WOVEN, THE CUTTING MEANS CONSISTING OF, A TEMPLE CASTING PROVIDED WITH A FACE PORTION HAVING AN INCLINED, UNDERCUT GROOVE EXTENDING ACROSS IT, A STRAIGHT BAR CONFORMING IN CROSS-SECTIONAL SHAPE TO THE GROOVE AND BEING NON-ROTATIVELY AND SLIDABLY MOUNTED IN THE GROOVE, THE BAR BEING PROVIDED AT ONE END WITH A CUTTER BLOCK RIGIDLY ATTACHED TO IT, THE CUTTER BLOCK HAVING ITS AXIS DISPOSED AT A FLAT ANGLE TO THE LONGITUDINAL AXIS OF THE BAR, THE ANGLE OF THE BAR IN RESPECT TO THE AXIS OF THE CUTTER BLOCK BEING SUCH AS TO CONFORM TO THE ANGULARITY OF THE GROOVE WHEREBY THE MAINTENANCE OF THE BAR IN THE ANGULAR GROOVE WILL DISPOSE THE CUTTER BLOCK SUBSTANTIALLY VERTICALLY AND THE INCLINATION OF THE GROOVE AND THE ANGLE AT WHICH THE BAR IS DISPOSED THERETHROUGH PERMITTING LONGITUDINAL GRAVITATIONAL SLIDING MOVEMENT OF THE BAR THROUGH THE GROOVE AND RELATIVELY TO THE GROOVE TO CAUSE LOWERING MOVEMENT OF THE CUTTER BLOCK TO THREAD-ENGAGING POSITION, A CUTTER-BOLT SLIDABLE THROUGH THE AXIAL PASSAGE IN THE CUTTER BLOCK, A PORTION OF THE CUTTER BLOCK BEING PROVIDED WITH NOTCHES FOR WEFT THREAD ENGAGEMENT TO ENABLE THE THREADS SO ENGAGED TO BE SERVED BY MOVEMENT OF THE CUTTER BOLT, AND MEANS FOR RECIPROCATING THE CUTTER BOLT. 